The violence broke out on 4th Avenue at around 2:20 a.m. Sunday. A friend explained that the sisters were at a party and ended up at the Slope Natural Plus Deli in the early morning hours.
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Authorities say 19-year-old Samyia Spain was fatally stabbed in the neck and chest. Her twin was stabbed in the arm.
Both sisters were transported to NewYork-Presbyterian Brooklyn Methodist Hospital, where Samyia died.
Eyewitnesses say the stabbing happened after the twins turned down one of the suspects' advances.
"So he called them names," one witness said. "They called him names back. He walked out. He walked down the block angry. And then a couple of like, two, three minutes later, he comes up and stays banging and kicking on the glass door, trying to get in."
The eyewitness said the young man's friend told him: you're drunk, let's go. But he did not.
"The second they opened the door, he ran back into the door and started attacking them," the witness said.
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Later on Sunday, friends and family held a small vigil at the scene of the attack.
"As a woman, that's infuriating," said a Park Slope resident named Sally. "We are not allowed to say no to a man without the risk of violence, without the risk of losing our lives. The fact that she was so young, she had her whole life ahead of her. It's enraging."
The sisters live only a couple of blocks from the area and were on their way home from a night hanging with friends. The surviving sister is now recovering at home.
Police are still searching for the two men who fled the scene.
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